I'm in that early morning mental fog
Things don't seem to click in the early morning. I know they should click because I remember them clicking yesterday. The early morning mental fog needs some time to roll away... to drift off into the corners of my mind so I can get something done today. It may come again tomorrow. Such is the way of things.
As my early morning mental fog is doing its early morning mental fog drifting, I usually get a cup of coffee or tea, sit bleary-eyed while reading through email, and then count the number of things in my todo list and divide by 10. I use that number to figure out early on whether I'm going to be measurably productive or whether it's just going to be one of those days where I spin my wheels a lot and don't really get anywhere.